Martensitic stainless steel composition, method for making a...

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C - Chemistry, Metallurgy

22

C

C22C 38/44 (2006.01) C21D 1/25 (2006.01) C21D 6/00 (2006.01) C21D 6/04 (2006.01)

Patent

CA 2612718

The invention concerns martensitic stainless steel, characterized in that its composition in weight percentages is as follows: 9 % = Cr = 13 %; 1.5 % = Mo = 3 %; 8 % = Ni = 14 %; 1 % = Al = 2 %; 0.5 % = Ti = 1.5 % with AI + Ti = 2.25 %; traces = Co = 2 %; traces = W = 1 % with Mo + (W/2) = 3 %; traces = P = 0.02 %; traces = S = 0.0050 %; traces = N = 0.0060 %; traces = C = 0.025 %; traces = Cu = 0.5 %; traces = Mn = 3 %; traces = Si = 0.25 %; traces = O = 0.0050 %; and is such that: Ms (°C) = 1302 42 Cr 63 Ni 30 Mo + 20AI - 15W - 33Mn - 28Si - 30Cu - 13Co + 10 Ti = 50Cr eq / Ni eq = 1 .05 with Cr eq (%) = Cr + 2Si + Mo + 1.5 Ti + 5.5 AI + 0.6W Ni eq (%) = 2Ni + 0.5 Mn + 3O C + 25 N + Co + 0.3 Cu. The invention also concerns a method for making a mechanical part using said steel, and the resulting part.

Acier inoxydable martensitique, caractérisé en ce que sa composition est, en pourcentages pondéraux : - 9% <= Cr <= 13% ; 1 ,5% <= Mo <= 3% ; 8% <= Ni <= 14% ; 1 % <= Al <= 2% ; 0,5% <= Ti <= 1 ,5% avec AI + Ti >= 2,25% ; traces <= Co <= 2% ; traces <= W <= 1 % avec Mo + (W/2) <= 3% ; traces <= P <= 0,02% ; traces <= S <= 0,0050% ; traces <= N <= 0,0060% ; traces <= C <= 0,025% ; traces <= Cu <= 0,5% ; traces <= Mn <= 3% ; traces <= Si <= 0,25% ; traces <= O <= 0,0050% ; et est telle que : ~ Ms (~C) = 1302 - 42Cr - 63Ni - 30Mo + 20AI - 15W - 33Mn - 28Si - 30Cu - 13Co + 10Ti >= 50 ~ Cr eq / Ni eq <= 1 ,05 avec Cr eq (%) = Cr + 2Si + Mo + 1,5Ti + 5,5AI + 0,6W Ni eq (%) = 2Ni + 0,5Mn + 3OC + 25N + Co + 0,3Cu. Procédé de fabrication d'une pièce mécanique utilisant cet acier, et pièce ainsi obtenue.

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